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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4792ebd9ea465f5d53195f4ba14ea3c02fa25528f2e1bf6c551d7bbc6da03f0' 
  AND token = 'HbQa1Wa57XIexQDNgZ0y0TFz23TgpwR2h/0gE/H4lUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}